Lathe-dog



W. T. lNGHAM.

LATHE DOG. APPLlCATlON HLED FEB. 24.!916- Patentad Aug. 232, 1916.

WENDELL T.'INGHAM, OF WILLIMANSETT, MASSACHUSETTS.

LATHE-DOG.

Application filed February 24, 1916.

To all whom, it may concern:

Be it known that I, WENDELL T. INGI-IAM, a citizen of the United States,residing at Will'imansett, in the county of Hampden, State ofMassachusetts, have invented certain new and useful Improvements inLathe- Dogs; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it apperta'ins to make and use the same.

The present invention is directed to improvements in lathe dogs and hasfor its object to provide a device of this character that the same canbe firmly secured to the work without the aid of set screws and thelike.

It is the usual practice to secure a lathe dog to the work through themedium of a set screw, but this has been found to be objectionable sincethe set screw projects outwardly and frequently catches in the clothingof the operator, and with dangerous results, and it is to overcome thisobjection that the present device has been perfected.

With these and other objects in View, this invention resides in thenovel features of construction, formation, combination and arrangementof parts to be hereinafter more fully described, claimed and illustratedin the accompanying drawing, in which Figure 1 is a front elevation ofthe device. Fig. 2 is a similar view, the cover plate removed. Fig. 3 isa sectional view on line 33 of Fig. 1. Fig. 4: is a detail perspectiveview of the gripping cam.

The device consists of a head 1, which has formed integral therewith atail 2, which extends laterally and is adapted to be engaged with theface plate in any well known manner. The head 1 is provided with acircular recess 3, the base of which has formed therein an eccentricallylocated work receiving opening a, which is alined'with the Specificationof Letters Patent.

Patented Aug. 22, 1916.

Serial No. 80,219.

work receiving opening 5 formed in the cover plate 6, said plate beingattached to the body by screws 7 An annular groove 8 is formed in thebase of the recess and is also arranged eccentrically with respect tothe opening 4, the purpose of which will appear later.

The work gripping cam 9 is semi-circular in shape and has its straightface 10 provided with a recess which is adapted to grip the work whenthe dog is in use. The cam engages the base of the recess 8 and isprovided with a lug 12, which slidably engages the groove 8, whereby thecam 9 is permitted to move across the openings 4 and 5 to grip work ofdifferent sizes and also serves to prevent said cam from entirelycovering said openings. Thus it will be seen that the dog can be quicklyapplied to the work and upon rotating the head in one direction, the camwill be firmly engaged with the work, and disengaged therefrom uponrotating the head in the opposite direction, and without the aid of atool.

What is claimed is A lathe dog comprising a head, said headhaving acircular recess formed therein, the base of said recess having aneccentrically located work engaging opening formed therein, a coverplate for the recess having an opening formed therein and in registrywith the first named opening, said recess having an annular grooveformed in its base and eccentrically located with respect to saidopenings, a gripping cam mounted in the recess and having a lug carriedthereby for slidably engaging the groove.

In testimony whereof, I al'liX my signature, in the presence of twowitnesses.

WENDELL T. INGHAM.

Witnesses:

F. J. MGKAY, AMELIA ROBERT.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, Washington, D. G.

